{"id":2976,"date":"2021-07-08T17:48:46","date_gmt":"2021-07-08T14:48:46","guid":{"rendered":"https:\/\/mailsafi.com\/blog\/?p=2976"},"modified":"2024-01-24T12:00:05","modified_gmt":"2024-01-24T09:00:05","slug":"best-email-filter-cannot-guarantee-100-protection","status":"publish","type":"post","link":"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/","title":{"rendered":"Why Even the Best Email Filter Cannot Guarantee 100% Protection"},"content":{"rendered":"\n<p>Having an email filter for any business is a crucial function of basic cybersecurity&nbsp;best practices.&nbsp; We may take them for granted, but spam filters keep us organized, protected, save our time, and maybe even a little saner than we would be without them.&nbsp;&nbsp;<\/p>\n\n\n\n<p>Read more about <a href=\"https:\/\/mailsafi.com\/blog\/email-spam-and-spam-filtering\/\">what spam and spam filtering means for businesses <\/a><\/p>\n\n\n\n<div class=\"wp-block-buttons is-horizontal is-content-justification-center is-layout-flex wp-container-core-buttons-layout-1 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-vivid-red-background-color has-background wp-element-button\" href=\"https:\/\/www.mailsafi.com\/email-security\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Sign up for MailSafi Email Security<\/strong><\/a><\/div>\n<\/div>\n\n\n\n<p>At the very least, spam email is a nuisance that will clog up staff mailboxes and overload your servers. Some forms of spam can be dangerous \u2014 the entry point for serious attacks that could wreak havoc on your PCs, your corporate network, your bottom line, and even your business reputation. Therefore, an email filtering solution is no doubt an essential first line of defense against spam.<\/p>\n\n\n\n<figure class=\"wp-block-pullquote is-style-default\"><blockquote><p><strong><em>Unfortunately, even the best spam filtering solutions cannot guarantee 100% protection from phishing or scam emails.<\/em><\/strong><\/p><\/blockquote><\/figure>\n\n\n\n<p>Given the high number and intensity of data breaches in recent years, there is a wealth of information available to phishers to use when designing their attacks. Particularly when it comes to <a href=\"https:\/\/www.mailsafi.com\/glossary\/phishing-email\">phishing emails<\/a>, these are carefully researched and designed to target specific recipients in an organization. The increasing sophistication of phishing attacks makes it difficult for technology to identify email-borne threats and block them.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_49 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"ez-toc-toggle-icon-1\"><label for=\"item-69db7edd7a607\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;direction:ltr;\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/label><input  type=\"checkbox\" id=\"item-69db7edd7a607\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#1_What_Do_Spam_Email_Filters_Check_For\" title=\"1. What Do Spam Email Filters Check For?\">1. What Do Spam Email Filters Check For?<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#11_What_is_Email_Header_Data\" title=\"1.1 What is Email Header Data?\">1.1 What is Email Header Data?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#12_What_is_a_Blacklist\" title=\"1.2 What is a Blacklist?\">1.2 What is a Blacklist?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#13_Email_Content_Analysis\" title=\"1.3 Email Content Analysis\">1.3 Email Content Analysis<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#2_No_Hard_and_Fast_Rules\" title=\"2. No Hard and Fast Rules\">2. No Hard and Fast Rules<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#3_How_spammers_create_their_attacks\" title=\"3. How spammers create their attacks\">3. How spammers create their attacks<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#4_Why_even_the_best_spam_email_filters_cannot_be_100_accurate\" title=\"4. Why even the best spam email filters cannot be 100% accurate\">4. Why even the best spam email filters cannot be 100% accurate<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#i\" title=\".\">.<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#5_In_short%E2%80%A6\" title=\"5. In short&#8230;\">5. In short&#8230;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#6_So_Do_I_Still_Need_an_Email_Filtering_Solution\" title=\"6. So Do I Still Need an Email Filtering Solution?\">6. So Do I Still Need an Email Filtering Solution?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mailsafi.com\/blog\/best-email-filter-cannot-guarantee-100-protection\/#Sign_up_for_MailSafi_Email_Security\" title=\"Sign up for MailSafi Email Security\">Sign up for MailSafi Email Security<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading has-vivid-red-color has-text-color\" style=\"font-size:28px\"><span class=\"ez-toc-section\" id=\"1_What_Do_Spam_Email_Filters_Check_For\"><\/span>1. <strong>What Do Spam Email Filters Check For?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>With each spam message that lands in your inbox, the more susceptible you are to cyber threats. Sanity aside, every business owner wants to protect their staff and their business data as best as possible. An email filter can help. While an email <a href=\"https:\/\/www.mailsafi.com\/email-spam-filter\">spam filter<\/a> can and should be configured to fit your business environment, they generally look at:&nbsp;<\/p>\n\n\n\n<ol style=\"list-style-type:1\">\n<li>Header Data<\/li>\n\n\n\n<li>Blacklists<\/li>\n\n\n\n<li>Email&nbsp;Content&nbsp;<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-red-color has-text-color\" style=\"font-size:24px\"><span class=\"ez-toc-section\" id=\"11_What_is_Email_Header_Data\"><\/span>1.1 <strong>What is Email Header Data?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Every email contains header data the average end-user will never see. This data includes information such as:<\/p>\n\n\n\n<ul>\n<li>Server IP addresses to show where the email has been, where it came from, and where it is going.<\/li>\n\n\n\n<li>Timestamps.<\/li>\n\n\n\n<li>Other information about the formatting of the message, and the addresses of the email senders and recipients.<\/li>\n<\/ul>\n\n\n\n<p>Spam filters check this data for indications that the message could be spam, such as:<\/p>\n\n\n\n<ul>\n<li>The timestamp not making sense for when the email was sent,<\/li>\n\n\n\n<li>If any of the IP addresses associated with it are blacklisted or,<\/li>\n<\/ul>\n\n\n\n<p>If the sender or recipient addresses are invalid.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-red-color has-text-color\" style=\"font-size:24px\"><span class=\"ez-toc-section\" id=\"12_What_is_a_Blacklist\"><\/span>1.2 <strong>What is a Blacklist?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Blacklists are lists of known spammers or spamming sources. These known spammers can be automatically blocked from being delivered to your mailbox by spam filters. Who makes these lists? Typically, Internet Service Providers (ISPs), server administrators, and email service providers compile these lists from data all over the world.<\/p>\n\n\n\n<p>As spam filters detect spam based on content analysis, security alerts, or maybe a flood of emails from a particular source, the source of these spam emails is tracked and placed on an email blacklist. Once a source is on a blacklist, the spam filters that reference this blacklist will typically start to block any emails coming from that blacklisted source.<\/p>\n\n\n\n<p>Read more on <a href=\"https:\/\/mailsafi.com\/blog\/what-is-blacklisting\/\">what is email blacklisting?<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-vivid-red-color has-text-color\" style=\"font-size:24px\"><span class=\"ez-toc-section\" id=\"13_Email_Content_Analysis\"><\/span>1.3 <strong>Email Content Analysis<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Another main area spam filters check is the content within the email. <strong>Filtering by the content is where this otherwise simple filtering system gets tricky. Whereas some things are black and white \u2013 blacklisted and not blacklisted, valid address or invalid address \u2013 content is a grey area<\/strong>. Of course, there are a few stand-out elements that are known spam indicators. Things such as blacklisted websites, executable file attachments or known spam keywords in the email are all red flags of spam. Executable file attachments are file types that can perform multiple functions and operations. These <strong>content guidelines, much like the entire IT industry, are constantly changing. This fluid motion of what is and isn\u2019t considered spam makes it so hard for spam filters to filter the good and bad properly<\/strong>.<\/p>\n\n\n\n<p>For example, shortcodes used to be flagged as spam. However, with the rise of social media, Twitter especially, shortcodes have become relatively often used in the body of an email. In turn, this makes it hard to justify that all shortcodes indicate that the email is spam.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-vivid-red-color has-text-color\" style=\"font-size:28px\"><span class=\"ez-toc-section\" id=\"2_No_Hard_and_Fast_Rules\"><\/span>2. <strong>No Hard and Fast Rules<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>So why is it that despite everything spam filters check, they are still not 100% accurate? First off, we\u2019re talking about technology. The only certainty about most technology is its uncertainty! Additionally, spam filters are working against both computers and the human brain. <\/p>\n\n\n\n<figure class=\"wp-block-pullquote is-style-default\"><blockquote><p><strong>As the industry evolves and scales, so do cybercriminals<\/strong>. <strong>Every article you read about how to enhance your cybersecurity, they read, too<\/strong>. <\/p><\/blockquote><\/figure>\n\n\n\n<p>Therefore, unfortunately, spammers know what is flagged when filtering emails and learn how to adapt to better trick the system and get past your spam filters.&nbsp;&nbsp;<\/p>\n\n\n\n<p>As we now know, a <a href=\"https:\/\/www.mailsafi.com\/email-security\" target=\"_blank\" rel=\"noreferrer noopener\">good email filtering system<\/a> must check several components within an email before marking it as spam. Most spam filters score email messages and add up points for each thing that could indicate spam. If the email scores high enough, then the spam filter will quarantine or block that email to keep it out of your inbox. If only one part, such as the <em>To<\/em> field, is scored as potential spam, but everything else checks out, that email will most likely still make it to your inbox.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-vivid-red-color has-text-color\" style=\"font-size:28px\"><span class=\"ez-toc-section\" id=\"3_How_spammers_create_their_attacks\"><\/span><strong>3. How spammers create their attacks<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>To understand this better, It is important to first understand the \u201cgame\u201d between spammers and spam filters a bit more. This makes it understandable why <em>some<\/em> spam always will find its way to your inbox.<\/p>\n\n\n\n<p><strong>Spam filters<\/strong>\u00a0try to <a href=\"https:\/\/www.mailsafi.com\/cloud-based-spam-filtering\">catch all mail that is spam<\/a>, while<\/p>\n\n\n\n<p><strong>Spammers<\/strong>&nbsp;try to create emails that are trusted not to be spam &#8211; both by spam filters and by humans. For spammers, this comes down to creating emails that: &#8211;<\/p>\n\n\n\n<ol style=\"list-style-type:1\">\n<li>Can pass spam filters;<\/li>\n\n\n\n<li>When they arrive in your inbox, look like legit emails so the user opens it;<\/li>\n\n\n\n<li>Are interesting enough so that you are enticed to follow the instructions in the email.<\/li>\n<\/ol>\n\n\n\n<p>Great spammers are successful because they too buy spam filters and use this to test their new spam tactics to see if their mail passes the email spam filter. If the email passes, they are one step ahead.<\/p>\n\n\n\n<p>The spammers then go out in the wild, send out millions of emails, effectively showing off their new tactics. The email spam-filter providers take notice, and they update their filters. This is an ongoing game. It&#8217;s similar in the virus industry.<\/p>\n\n\n\n<p>Spam with no links or attachments is probably spamming to poison\/confuse filters to make it easier to fool them later on.<\/p>\n\n\n\n<p>For instance, if you send an email but forget to enter a subject, your email will typically still be delivered. However, if an email has no subject, a sender name that doesn\u2019t match its email address, and has a suspicious attachment, the chances are that email will be marked as spam and never make it to your inbox.<\/p>\n\n\n\n<p>And this is the main reason why even the best email filters cannot be 100% accurate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-vivid-red-color has-text-color\" style=\"font-size:28px\"><span class=\"ez-toc-section\" id=\"4_Why_even_the_best_spam_email_filters_cannot_be_100_accurate\"><\/span>4. <strong>Why even the best spam email filters cannot be 100% accurate<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Spammers are constantly trying to outwit anti-spam filters. For example, one spam detection method is to block email that <strong>exactly<\/strong> <strong>matches<\/strong> known spam messages. Once email service providers began comparing incoming email to known spam and blocking any email messages with content that matched known spam, spammers simply started inserting random words in the body of their spam email, often in text invisible to users by having the color of the text match the color of the background for the message, e.g., white text on a white background. In so doing, the spam filters could no longer rely on exact matches against known spam messages.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"i\"><\/span>.<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Now that you understand how clever some spammers out there are, if you were to set a hard and fast rule that ALL emails without a subject line are blocked, you\u2019d probably miss out on some genuine emails you want to receive. Although these grey areas allow you to get genuine emails, it can also lead to spam emails getting in (boo!). This is where configuring your spam filters to best suit your specific needs can work wonders for your business.<\/p>\n\n\n\n<figure class=\"wp-block-pullquote is-style-default\"><blockquote><p><strong>The only email filter that will not let ANY spam through will not let any good mail through either. For a 100% effective spam filter, you will simply have to configure the filter to <u>block all incoming mail.<\/u><\/strong><\/p><\/blockquote><\/figure>\n\n\n\n<p>Such a filter would be unacceptable, though. Therefore, the challenge for email service providers and businesses is to find a balance between blocking spam and allowing legitimate emails in. If the filter is too strict, there will likely be many false positives, resulting in many genuine emails being blocked.<\/p>\n\n\n\n<p>Some users may prefer to have less strict settings so that no legitimate email is blocked, but that means more spam gets through. In contrast, other users may have very low tolerance for spam emails that they are willing to trade off the possibility of legitimate email being blocked or quarantined in return for getting less spam in their inbox. A company dealing with a large number of email users needs to pick a moderate level of email filtering that applies to all users so that some spam gets through, but, hopefully, result only in a few false positives.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-vivid-red-color has-text-color\" style=\"font-size:28px\"><span class=\"ez-toc-section\" id=\"5_In_short%E2%80%A6\"><\/span>5. In short&#8230;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-pullquote is-style-default\"><blockquote><p><strong>Cybercriminals are constantly trying to outwit email filters.<\/strong><\/p><\/blockquote><\/figure>\n\n\n\n<p>Spam is an arms race where spammers invent new ways to get around the email filters which even the <a href=\"https:\/\/mailsafi.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">best email security companies<\/a> develop. When filters get updated to block the latest ploys, cyberattackers go back to design another way to get in.<\/p>\n\n\n\n<p>While email security providers are smart, so are the spammers. Therefore, no matter how good an email filter is, <em>some<\/em> spam is going to get through at some point. 300&nbsp;<strong>Billion<\/strong>&nbsp;spam emails are sent every day using hundreds of different ways to deceive filters.<\/p>\n\n\n\n<figure class=\"wp-block-pullquote is-style-default\"><blockquote><p><strong>Even with the best technology from some of the finest minds in the industry, some will still sneak through to your inbox.<\/strong><\/p><\/blockquote><\/figure>\n\n\n\n<p>Yes, we completely understand your frustration when one spam email ends up in your inbox, and this is why we\u2019re so passionate about email security. Even as staff who work for an email security company, we too are targets of spammers &#8211; and although <em>almost<\/em> <em>all<\/em> get picked up by our anti-spam filters, the occasional one sneaks by and lands in our inboxes.<\/p>\n\n\n\n<p>This is because if email filter rules were \u201ctightened too much\u201d to attempt to capture 100% of phishing emails, they will likely have adverse effects, such as stopping the legitimate emails that you need to conduct your business. Some emails will not be received in users\u2019 mailboxes and be assumed to be missing or, worse yet, result in lost business opportunities. Therefore, it is important to create just adequate rules that will provide the security you need for your network but not cause you to have your genuine emails completely blocked or quarantined.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-vivid-red-color has-text-color\" style=\"font-size:28px\"><span class=\"ez-toc-section\" id=\"6_So_Do_I_Still_Need_an_Email_Filtering_Solution\"><\/span>6. <strong>So Do I Still Need an Email Filtering Solution?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Absolutely <strong>YES<\/strong>! Email spam filtering, even though it\u2019s not 100% accurate all of the time, is a vital investment to protect your business from email threats, and it can only get better from here.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-horizontal is-content-justification-center is-layout-flex wp-container-core-buttons-layout-2 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-vivid-red-background-color has-background wp-element-button\" href=\"https:\/\/www.mailsafi.com\/email-security\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Click to sign up for MailSafi Email Filtering Service<\/strong><\/a><\/div>\n<\/div>\n\n\n\n<p>If your anti-spam solution keeps a log of the emails that have been blocked and\/or a quarantine database, you can also access this to view the&nbsp;<em>unseen<\/em>&nbsp;good work it has done and realize that your inbox would have been <strong>much worse<\/strong> <strong>without<\/strong> <strong>it<\/strong>.<\/p>\n\n\n\n<p>An important criterion to consider is choosing an email filtering solution that applies innovations and evolves as technology grows. In this way, it improves its effectiveness and keeps up with changes in the cybersecurity world. Read more: <a href=\"https:\/\/www.mailsafi.com\/15-must-have-features-for-your-spam-filtering-service\" target=\"_blank\" rel=\"noreferrer noopener\">What to look for when looking for an email filtering solution<\/a><\/p>\n\n\n\n<p>Advances in technology such as algorithms for machine learning continue to improve the results of email filtering services. Another advanced technology available is DKIM (DomainKeys Identified Mail). DKIM affixes a digital signature to emails coming from senders to validate the email is really from who it says it is from. SPF (Sender Policy Framework) leverages DNS technology to validate email is coming from a valid source. Most recently, DMARC (Domain-based Message Authentication, Reporting and Conformance) is being adopted by many organizations to extend the effectiveness of DKIM and SPF, further preventing cyberattackers from spoofing email addresses and impersonating your CEO!<\/p>\n\n\n\n<p class=\"has-light-green-cyan-background-color has-background\"><a href=\"https:\/\/www.mailsafi.com\/hosted-email-security-for-business\" target=\"_blank\" rel=\"noreferrer noopener\">MailSafi Email Security<\/a> is a leading hosted email filtering solution that offers protection against spam, viruses, malware, phishing attacks, spoofing, ransomware and other advanced email threats. Below is an illustration of how MailSafi Email Filtering works.<\/p>\n\n\n<div class=\"wp-block-image is-style-default\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"714\" src=\"https:\/\/mailsafi.com\/blog\/wp-content\/uploads\/2021\/07\/Indepth-Understanding-of-How-MailSafi-Email-Security-Works-1024x714.jpg\" alt=\"\" class=\"wp-image-2979\" srcset=\"https:\/\/mailsafi.com\/blog\/wp-content\/uploads\/2021\/07\/Indepth-Understanding-of-How-MailSafi-Email-Security-Works-1024x714.jpg 1024w, https:\/\/mailsafi.com\/blog\/wp-content\/uploads\/2021\/07\/Indepth-Understanding-of-How-MailSafi-Email-Security-Works-300x209.jpg 300w, https:\/\/mailsafi.com\/blog\/wp-content\/uploads\/2021\/07\/Indepth-Understanding-of-How-MailSafi-Email-Security-Works-768x536.jpg 768w, https:\/\/mailsafi.com\/blog\/wp-content\/uploads\/2021\/07\/Indepth-Understanding-of-How-MailSafi-Email-Security-Works.jpg 1127w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>Read more on <a href=\"https:\/\/mailsafi.com\/blog\/8-reasons-why-you-should-outsource-your-spam-filtering\/\" target=\"_blank\" rel=\"noreferrer noopener\">8 reasons why you should outsource your spam filtering<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-vivid-red-color has-text-color\" style=\"font-size:28px\"><span class=\"ez-toc-section\" id=\"Sign_up_for_MailSafi_Email_Security\"><\/span>Sign up for MailSafi Email Security<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-light-green-cyan-background-color has-background\"><a href=\"https:\/\/www.mailsafi.com\/subscribe\/signup\" target=\"_blank\" rel=\"noreferrer noopener\">Sign up today<\/a> or <a href=\"https:\/\/www.mailsafi.com\/contact-us\" target=\"_blank\" rel=\"noreferrer noopener\">request a call back<\/a> to learn more about how our cloud-based email security service. <a href=\"https:\/\/www.mailsafi.com\/email-security\" target=\"_blank\" rel=\"noreferrer noopener\">MailSafi Email Security<\/a> is compatible with on-premise servers like Zimbra, Exchange, etc.; shared hosting environments such as cPanel, etc., as well as Microsoft Office 365.<\/p>\n\n\n\n<p class=\"has-light-green-cyan-background-color has-background\"><a href=\"https:\/\/www.mailsafi.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.mailsafi.com\/<\/a>Not what you\u2019re looking for? Check out our other services including cloud-based email and collaboration, email archiving, domain registration, cybersecurity training, domain and website hosting.<\/p>\n<div class=\"pvc_clear\"><\/div><p id=\"pvc_stats_2976\" class=\"pvc_stats all  \" data-element-id=\"2976\" style=\"\"><i class=\"pvc-stats-icon large\" aria-hidden=\"true\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" version=\"1.0\" viewBox=\"0 0 502 315\" preserveAspectRatio=\"xMidYMid meet\"><g transform=\"translate(0,332) scale(0.1,-0.1)\" fill=\"\" stroke=\"none\"><path d=\"M2394 3279 l-29 -30 -3 -207 c-2 -182 0 -211 15 -242 39 -76 157 -76 196 0 15 31 17 60 15 243 l-3 209 -33 29 c-26 23 -41 29 -80 29 -41 0 -53 -5 -78 -31z\"\/><path d=\"M3085 3251 c-45 -19 -58 -50 -96 -229 -47 -217 -49 -260 -13 -295 52 -53 146 -42 177 20 16 31 87 366 87 410 0 70 -86 122 -155 94z\"\/><path d=\"M1751 3234 c-13 -9 -29 -31 -37 -50 -12 -29 -10 -49 21 -204 19 -94 39 -189 45 -210 14 -50 54 -80 110 -80 34 0 48 6 76 34 21 21 34 44 34 59 0 14 -18 113 -40 219 -37 178 -43 195 -70 221 -36 32 -101 37 -139 11z\"\/><path d=\"M1163 3073 c-36 -7 -73 -59 -73 -102 0 -56 133 -378 171 -413 34 -32 83 -37 129 -13 70 36 67 87 -16 290 -86 209 -89 214 -129 231 -35 14 -42 15 -82 7z\"\/><path d=\"M3689 3066 c-15 -9 -33 -30 -42 -48 -48 -103 -147 -355 -147 -375 0 -98 131 -148 192 -74 13 15 57 108 97 206 80 196 84 226 37 273 -30 30 -99 39 -137 18z\"\/><path d=\"M583 2784 c-38 -19 -67 -74 -58 -113 9 -42 211 -354 242 -373 16 -10 45 -18 66 -18 51 0 107 52 107 100 0 39 -1 41 -124 234 -80 126 -108 162 -133 173 -41 17 -61 16 -100 -3z\"\/><path d=\"M4250 2784 c-14 -9 -74 -91 -133 -183 -95 -150 -107 -173 -107 -213 0 -55 33 -94 87 -104 67 -13 90 8 211 198 130 202 137 225 78 284 -27 27 -42 34 -72 34 -22 0 -50 -8 -64 -16z\"\/><path d=\"M2275 2693 c-553 -48 -1095 -270 -1585 -649 -135 -104 -459 -423 -483 -476 -23 -49 -22 -139 2 -186 73 -142 361 -457 571 -626 285 -228 642 -407 990 -497 242 -63 336 -73 660 -74 310 0 370 5 595 52 535 111 1045 392 1455 803 122 121 250 273 275 326 19 41 19 137 0 174 -41 79 -309 363 -465 492 -447 370 -946 591 -1479 653 -113 14 -422 18 -536 8z m395 -428 c171 -34 330 -124 456 -258 112 -119 167 -219 211 -378 27 -96 24 -300 -5 -401 -72 -255 -236 -447 -474 -557 -132 -62 -201 -76 -368 -76 -167 0 -236 14 -368 76 -213 98 -373 271 -451 485 -162 444 86 934 547 1084 153 49 292 57 452 25z m909 -232 c222 -123 408 -262 593 -441 76 -74 138 -139 138 -144 0 -16 -233 -242 -330 -319 -155 -123 -309 -223 -461 -299 l-81 -41 32 46 c18 26 49 83 70 128 143 306 141 649 -6 957 -25 52 -61 116 -79 142 l-34 47 45 -20 c26 -10 76 -36 113 -56z m-2057 25 c-40 -58 -105 -190 -130 -263 -110 -324 -59 -707 132 -981 25 -35 42 -64 37 -64 -19 0 -241 119 -326 174 -188 122 -406 314 -532 468 l-58 71 108 103 c185 178 428 349 672 473 66 33 121 60 123 61 2 0 -10 -19 -26 -42z\"\/><path d=\"M2375 1950 c-198 -44 -350 -190 -395 -379 -18 -76 -8 -221 19 -290 114 -284 457 -406 731 -260 98 52 188 154 231 260 27 69 37 214 19 290 -38 163 -166 304 -326 360 -67 23 -215 33 -279 19z\"\/><\/g><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/mailsafi.com\/blog\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p><div class=\"pvc_clear\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Having an email filter for any business is a crucial function of basic cybersecurity&nbsp;best practices.&nbsp; 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